Zanies Kitty Krackling Hide-n-Seek Sack Green A plastic krinkle lining between layers of cotton fabric entices cats to play. Wire rim on the mouth of the bag keeps sack open so cats can enter and exit with ease. Velcro closure at end allows bag to be converted into a fun tunnel. Kitty Krackling Hide-n-Seek Sack comes in a bright neon green color with a cute kitty print and eyelet trim for added appeal Versatile Zanies Kitty Krackling Hide-n-Seek Sack provides hours of fun for active cats